String concatenation in python

There are many string connection methods in python, to summarize:
1 The most original string connection method: str1 + str22 python new string connection syntax: str1, str23 Strange string method: str1 str24 % connection string: ' name:%s; sex: ' % ('tom', 'male')5 String list connection: str.join(some_list)
The first method is probably known to anyone with programming experience, just use it directly "+" to connect two strings:
'Jim' + 'Green' = 'JimGreen'
The second one is more special. If the two strings are separated by "comma", then the two strings will be concatenated. , however, there will be an extra space between the strings:
'Jim', 'Green' = 'Jim Green'
The third type is also unique to Python, just put the two strings together, there is a space or No blanks: two strings are automatically concatenated into one string:
'Jim''Green' = 'JimGreen' 'Jim' 'Green' = 'JimGreen'
The fourth function is more powerful and draws on the printf function in C language Function, if you have a C language foundation, just read the documentation to find out. This method uses the symbol "%" to connect a string and a group of variables. The special marks in the string will be automatically replaced with the variables in the variable group on the right:
'%s, %s' % ('Jim', ' Green') = 'Jim, Green'
The fifth technique is to use the string function join. This function accepts a list and then connects each element in the list with a string:
var_list = ['tom', 'david', 'john']
a = '###' a.join(var_list) = ' tom###david###john'